linux-kernel - Re: staging: comedi: non working tests on unsigned cmd->convert

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Date:	Tue, 21 Apr 2009 15:22:27 +0200
From:	Roel Kluin <roel.kluin@...il.com>
To:	Greg KH <gregkh@...e.de>
CC:	lkml <linux-kernel@...r.kernel.org>
Subject: Re: staging: comedi: non working tests on unsigned cmd->convert_arg

Roel Kluin wrote:
> vi drivers/staging/comedi/comedi.h +342
> 
> and note that cmd->convert_arg in s626_ai_cmdtest() is unsigned. Should there
> maybe be a test:
> 
> if (cmd->convert_src == TRIG_EXT && cmd->convert_arg > MAX)
> 
> (and what should MAX be then?)

The same question for cmd->scan_begin_arg and cmd->start_arg.

Otherwise you may want to apply the cleanup patch below
------------------------------>8-------------8<---------------------------------
Remove redundant tests on unsigned

Signed-off-by: Roel Kluin <roel.kluin@...il.com> 
---

diff --git a/drivers/staging/comedi/drivers/s626.c b/drivers/staging/comedi/drivers/s626.c
index 30dec9d..637b0f1 100644
--- a/drivers/staging/comedi/drivers/s626.c
+++ b/drivers/staging/comedi/drivers/s626.c
@@ -1886,7 +1886,7 @@ static int s626_ai_cmdtest(struct comedi_device *dev, struct comedi_subdevice *s
 		err++;
 	}
 
-	if (cmd->start_src == TRIG_EXT && cmd->start_arg < 0) {
+	if (cmd->start_src == TRIG_EXT) {
 		cmd->start_arg = 0;
 		err++;
 	}
@@ -1896,7 +1896,7 @@ static int s626_ai_cmdtest(struct comedi_device *dev, struct comedi_subdevice *s
 		err++;
 	}
 
-	if (cmd->scan_begin_src == TRIG_EXT && cmd->scan_begin_arg < 0) {
+	if (cmd->scan_begin_src == TRIG_EXT) {
 		cmd->scan_begin_arg = 0;
 		err++;
 	}
@@ -1906,7 +1906,7 @@ static int s626_ai_cmdtest(struct comedi_device *dev, struct comedi_subdevice *s
 		err++;
 	}
 
-	if (cmd->convert_src == TRIG_EXT && cmd->convert_arg < 0) {
+	if (cmd->convert_src == TRIG_EXT) {
 		cmd->convert_arg = 0;
 		err++;
 	}

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